By Steven Musil Twitter is warning some users that they may be the target of security breaches by "state-sponsored actors."

The microblogging service sent emails to an unknown number of users warning that hackers may be trying to obtain phone numbers, email addresses and IP addresses, according to Twitter users who have received the emails. The emails warn that while Twitter is not certain recipients' personal information was obtained, it has reason to believe they were intended targets."At this time, we have no evidence they obtained your account information, but we're actively investigating this matter," according to Coldhak, a Canada-based nonprofit organization that posted a copy of the letter it received on Twitter. "We wish we had more we could share, but we don't have any additional information we can provide at this time.